Picture-film.



I'. B. THOMPSON.

- PICTURE FILM.-

nrLIoATIon Hun lov.1. 1909.

987,092. 4 Patented Mr.14,1911,

11 j' JJ W A v E.; if l D Y D I vl r 1' um? @ged/Mag 67201790 Mwy 'while the webbing is quite as flexible as those UNITED sTATEs PATENToEEIoE.

FnEnIcx B. THOMPSON, or CHICAGO, ILLINOIS, As'sIGNoIt BY nIaEcT ANDMEsNE ASSIGNMENTS, To NATIONAL WATERPROOF FILM COMPANY, or CHICAGO,ILLINOIS,

A CORPORATION or ILLINOIS,

' PICTURE Specification of L FILM- Patented Mar. 14, 1911.

etters Patent.

Continuation of application Serial No. 452,845, 4filed September 14,1908. This applic/ation led November 1, 1909. SerialNo. 525,780.

To all whom 'it may concern:

Be it known that I, FREDRICK B. THOMP- soN, a citizen of the UnitedStates, and resident of Chicago, county of Cook, and State of Illinois,have invented certain new and useful Improvements in 4Picture-Films, ofwhich the following is a specification, and4 which are illustrated inthe accompanying drawings,l forming a part thereof.

The invention relates to transparent picture-carrying webs, such as areemployed for projectingy upon a screen in rapid succession a largenumber of pictures representing moving objects.

The object of the invention is to provide a picture-carrying film of thetype described which shall be more durable than those heretoforeemployed, and which may be cleaned, v as by Washing with water, fromtime to timel without injury.

The picture-carrying webs heretofore employed 1n so-called movingpicture machines have been formed of Celluloid; or of a generallysimil-ar but less inflammable material, termed acetate of cellulose,having applied to one face a photographic film ofgelatin. Thisphotographic film of gelatin is readily scratched and otherwise marredby use in the machines employed tor projecting the pictures upon-ascreen, and as it readily absorbs water it cannot be cleaned withoutinjury. `In the 4use of these picture-carrying webs theyare rapidly-moved through machines which produce a considerable tensile stra-inupon the web. These machines also require that the web shall traverse atortuous path, and therefore necessitate their being exceedinglyflexible. l

The invention contemplatesI a webbing for use in moving picturemachines, which comprises a photographic gelatin film interposed betweena carrying web and a coating of substantially the same character',whereby the gelatin film is protected upon both sides,

heretofore employed.

In the accompanying drawings z-TFigure 1 is a. longitudinal sectionalview showing a webbing constructed accordinv to/the invention, highlymagnified; and iig. 2 is a detail face view of the same, partly brokenaway.

In carrying out the invention a webbing represent motion. A protectivecoating 15,

jing conveniently .formed by punching the gelatin-coated web.Transparent pictures, as 12, 13, 14, are then formed in the gelatin film11 by exposure and development, ac# cording to the `,usual practice forproducing pictures for projection `upon a screen to preferably ofsubstantially the same characterasI the webbing 10, is then applied to`the -upper surface of the gelatin film 11. This protective coa-ting ismost .conveniently applied lto the film in liquid form, as by theapplication with a brush or roller (not shown) of avvarnish, which, whenhardened, as by exposure to .the air, leaves a deposit on the filmresembling the material of the web 10 in character and having a similarglass-like surface Most desirably the coating of varnish is applied tothe enti-re surface of the gelatin film but without closing theapertures 16, whereby the protective coating is provided with marginalrows of sprocket-engaging apertures registering with the apertures 16formedl by punching the gelatin-coated web 10.

A varnish which I term a Celluloid var nish, and vcomposed of a solutionof gun-cotton in amylacetate with a small amount of castor oil addedthereto for the purpose of `softening the coating, leaves, when hardenedcovered by a resistant film of celluloid varnish and of such a nature'that scratches may be obliterated by a subsequent deposit of similarmaterial.

3. A transparency for the projection of moving pictures, comprising acontinuous i photographic picture fi Picture films constructed accordingto the g invention may be cleaned by washlng with soap and water, and ifthe surface becomes e scratched through use, the scratches may beobliterated by a further application of the varnish.

IVhile I have described the webbing 10 as being of Celluloid, it may beof the less inflammable acetate of cellulosepreviously mentioned, andstill be off'substantially the same character with respect to itstransparency, fiexibilty, and the manner in which it. adheres to thegelatin picture film 11 as the protective coatingi deposited from avarnish consisting of a solution of gun cot-- ton. Furthermore, I havefound that picture films comprising a supporting web 10J of acetate ofcellulose and a protect-ive coating 'l5v of a varnish consisting of asolution of gun cotton, are not noticeablyT more inflammable thanpicture films having a supporting web of acetate of cellulose and beingwithout a protective coating. It desired, however, t-he protectivecoating 15 may be of a varnish consisting of a solution of the acetateof cellulose.

I claim as my invention l. Avtranspareney for the projection of movingpictures comprising a continuous photographic picture film interposedbetween a fiexible transparent carrying web and a coating ofsubstantially the same charaeter as the web, theweb and coating beingpermanently adhered to opposite faces of the picture film.

A transparency for the projection of moving pictures comprising acontinuous photographic picture film carried by a fiexible transparentweb, the picture film being m carried by a flexible transparent webhaving a marginal row of sprocket-engaging apertures, the picture filmbeing covered by a resistant film of a cellul'oid varnish withoutclosing the sprocket-engaging apertures of the carrying web and being ofsuch anature that scratches may be obliterate'dby a subsequent depositof similar material.

4. A transparency for the projection of moving pictures, comprising acontinuous photographic picture film carried by a flexible transparentweb having a marginal row of sprocket-engaging apertures and a glasslikeluider-surface, the picture film being covered by a resistant fihndeposited of a Celluloid varnish without closing the sprocket Iaperturesof the carrying web, such resistant film also having a glass-likesurface.

5. A transparency for the projectionV of moving pictures, comprisingaeontinuous photographic picture film .interposed between a fiexibletransparent carrying web and a coating of substantially the samecharacter as the web.

6. A transparency for the projection of moving pictures, comprising a-continuous photographic picture film carried by a flexible. transparentWeb having a marginal row of sprocket-engaging apertures and a glasslikeunder surface, the picture film being covered by a resistant film whichdoes not close the sprocket a ertures of the carrying web, suchresist-ant lm also having a glasslike surface. i

' FREDRICK B. THOMPSON.y IVitnesses:

HERBERT H. DYKE, JOHN M. CANFIELD.

